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Non existant docs.
IMHO one of the first steps of starting a project is to write a README.
Though, at least there are few examples: https://github.com/gutomaia/pyNES/tree/0.1.x/pynes/examples
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@emodendroket "Isn't the fun of writing NES software basically doing it like guys would have done in the 80s?" - I did stuff in the 80s, there was nothing fun about having to leave comments out of your code for the lack of memory, or using a clumsy compiler and/or editor. Cross-compiling is the way to go! Just making these old systems do things is the point, and keeping them alive.
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Here is the library I used. http://shiru.untergrund.net/articles/programming_nes_games_i... It is pretty simple but you will need some about how NES works.
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I remember them using a C64 emulator as one of the examples.
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https://en.wikipedia.org/wiki/NESticle